I’m converting from PDF to SVG with flattening off, and the conversion is inaccurate. If I set the flatten option to fast or simple, the converted page is correct but the pixelization is unacceptably bad. So I can’t use flattening.
One solution may be for you to use Flattener beforehand, flattening from the source PDF to a flattened PDF (which could then be converted to SVG). That would allow you to control the flattening options to get high-quality output (such as SetDPI, SetMaximumImagePixels, or SetThreshold):
For example, you could “pre-flatten” a PDF document with the following code (from http://www.pdftron.com/pdfnet/samplecode.html#Optimizer):
using (PDFDoc doc = new PDFDoc(@“G:\995.pdf”))
Flattener fl = new Flattener();
// The following lines can increase the resolution of background
// This line can be used to output Flate compressed background
// images rather than DCTDecode compressed images which is the default
// In order to adjust thresholds for when text is Flattened
// the following function can be used.
// We use e_fast option here since it is usually preferable
// to avoid Flattening simple pages in terms of size and
// rendering speed. If the desire is to simplify the
// document for processing such that it contains only text and
// a background image e_simple should be used instead.
After converting the pre-flattened PDF document to SVG, the output appears quite legible.